SpoIVA is designated stage IV sporulation protein A. It acts in the mother cell compartment and plays a role in spore coat morphogenesis. A comparative genome analysis of all sequenced genomes of Firmicutes shows that the proteins are strictly conserved among the sub-set of endospore-forming species [1,2,3]. This protein assembles into static polymers driven by ATP hydrolysis and is anchored to the outer forespore membrane through its C-terminal domain [3]. This entry represents the ATPase domain located at the N-terminal of SpoIVA [1,2]. It contains a conserved 'sensor' threonine residue that is involved in coordinating a Mg+2 ion [3].

1: A four-dimensional view of assembly of a morphogenetic protein during sporulation in Bacillus subtilis. Price KD, Losick R; J Bacteriol. 1999;181:781-790. PMID:9922240

2: Morphogenesis of the Bacillus anthracis spore. Giorno R, Bozue J, Cote C, Wenzel T, Moody KS, Mallozzi M, Ryan M, Wang R, Zielke R, Maddock JR, Friedlander A, Welkos S, Driks A; J Bacteriol. 2007;189:691-705. PMID:17114257

3: ATP hydrolysis by a domain related to translation factor GTPases drives polymerization of a static bacterial morphogenetic protein. Castaing JP, Nagy A, Anantharaman V, Aravind L, Ramamurthi KS; Proc Natl Acad Sci U S A. 2013;110:E151-E160. PMID:23267091